Ok guys, I need your help again!

Here's what I want to do:

I have to import a MIDI song into Pro Tools, so I can mute the drums and record while listening to the other stuff in the song.

Here's what I did so far:
I imported the song into Pro Tools. That gave me 16 channels of MIDI, all with stuff on them. OK so far.
Then I need some virtual instrument to turn the MIDI into audio, right? So I went with Ableton Live.

I know it works with Pro Tools through ReWire, but here is the problem.

MIDI channels don't have the plugin buttons on them, so I can't put ReWire on them. But I guess I only need ReWire to RECEIVE the sound from Live, so I did this:

I use a M-Audio Project Mix, so I mapped the 16 channels to M-Audio Control channels 1-16.
Then, created an AUX channel, and activated ReWire in it.

Then opened up Live. It starts as a Slave, and follows PT playback. Everything good so far.

The default Live set comes with an audio channel and a MIDI channel. I configured the audio channel to send the audio to ReWire Out, as instructed by Ableton's site.

But...I can't hear anything when I play the track! What am I missing here?

There are two basic methods for midi via pro tools:

1) Midi track + Aux track

2) Instrument track (Midi/Aux combo-track)

It sounds as though you may not have set up your midi inputs/outputs in ableton. Simply running it as a host app is not enough. You still have to set up input/outputs in both programs. Have you read the guide provided by Propellerhead.se (Propellerheads, creators of Reason and Rewire) They have a guide for using rewire with all of the different software that supports their open source rewire protocol. If you have not go here:

http://www.propellerheads.se/learning/dsp_mainframe.cfm

And click on the Ableton Live tutorial provided by propellerheads. I've found getting the info straight from "the horse's mouth" (*rewire creators*) is usually better than trying to follow the manuals given out with the host software. (Because usually they just gloss over the Rewire stuff)